Standard Service for Creating Notification

Hi All

We create an M6/M7 type notification using IW21/IW22.

It is categorized as a QM type notification though M6/M7 are PM type notifications.

In IW21 we can specify 'Responsible Parties' and save.

We are using following service for this:

MaintenanceRequestCreateRequestConfirmation_In (in ESA ECC-SE).

The service works for the most part (FL, Priority, Long Text) but when attempting to add Partners (to the ‘Responsible Parties’ tab),
it has no XML payload for that option.

Is there any other service or option to achieve this requirement?

Regards,

Umesh